In the season finale, Frank accidentally hits Dennis' car, which turns into a real tragedy when Dennis spills his cereal all over himself. Of course, in order to resolve this legal issue, The Gang decides to hold a trial at Paddy's, with Dee and Charlie serving as lawyers.When Charlie comes over to his mother's house, she confesses that she has lung cancer and needs money for an operation.Elsewhere, Dennis is mistaken for a Canadian businessman after finding his wallet at the bar and uses his new identity in quite disturbing ways.As Charlie's mom battles the lung cancer, Mac, Charlie and Dennis are holding a "Beef & Beer & Jesus" fundraiser at Paddy's; Frank and Dee are on a quest to find buried treasure. With Charlie under his wing, Frank cleans up so he can get his hands dirty and help out his old company with one last big merger; and Dee,It's Always Sunny in Philadelphia Seasons 1-10 DVD Dennis and Mac try to get some benefits out of Frank's "new" status. The whole Gang falls into an obsession with computer games. The whole Gang takes a night off from Paddy's to put on airs at Guigino's Italian Restaurant.